,we can find that the reasons why (environment are polluted

　　more and more seriously) are as follows.

　　　the primary reason ,i think , is (the reason of harmful substances into

　　environment . for example ,to prevent insects ,farmers make use of great

　　amounts of insecticides, so as to have bumper harvests . however ,they

　　pollute air ,water and land ).

　　second,(the gas coming from the car engines and factories also make

　　environment polluted badly ).

　　the third reason actually is (the result of a growing population in

　　the world . everyday , so much litter and waste are poured out from

　　houses ,also pollute the environment ).

　　the significance for (controlling pollution ) noted that it's high

　　time that more effective measures should be taken .

　　therefore ,(new laws should be passed to limit the amount of pollutants

　　from factories . moreover ,in the households ,there is an obvious need

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